IEEJ Transactions on Sensors and Micromachines
Online ISSN : 1347-5525
Print ISSN : 1341-8939
ISSN-L : 1341-8939
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Volume 131, Issue 10
Displaying 1-11 of 11 articles from this issue
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Special Issue on “Design and Fabrication of Integrated Sensor”
Preface
Special Issue Review
Special Issue Paper
  • Optical Design and Receiving Characteristics of Two Lens Type Visible Light Communication System
    Yoshinori Matsumoto, Hiromichi Nakada
    2011 Volume 131 Issue 10 Pages 351-356
    Published: October 01, 2011
    Released on J-STAGE: October 01, 2011
    DOIhttps://doi.org/10.1541/ieejsmas.131.351
    JOURNAL FREE ACCESS
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    This paper describes the optical design for two lens type visible light communication system to reduce back ground noise. The system is composed of image sensor, receiving element and control software. The selected area for the receiving element was calculated by considering the chip size, focal length of lens and the pitch between image sensor and receiving element on the PCB board. The communication length is expected in proportional to the focal length of lens. LED sources were modulated with sub-carrier 4bit pulse position modulation of visible light ID at the carrier frequency of 28.8kHz. The communicational length of the system by using commercialized high sensitive photo transistor was measured up to 16.5m for the focal length of 12mm. In the photo-transistor array system, the brightness and illuminant size from the image sensor is used to identify the signal source. The system separates the data from multi signal sources by selecting the arbitrary receiving element.
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  • Natural Frequency Design for an Integrated Capacitive MEMS Inertial Sensor
    Heewon Jeong, Munenori Degawa, Yasushi Goto
    2011 Volume 131 Issue 10 Pages 357-362
    Published: October 01, 2011
    Released on J-STAGE: October 01, 2011
    DOIhttps://doi.org/10.1541/ieejsmas.131.357
    JOURNAL FREE ACCESS
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    A capacitive microelectromechanical systems (MEMS) inertial sensor that is able to measure an acceleration and angular rate (rotation) simultaneously has been developed. Integration is the only practical approach to realizing low-cost and small-size sensors, largely because both assembling and aligning tasks for individual sensors such as for accelerometers and gyroscopes are eliminated. In this paper the developed sensor shares mechanical parts such as seismic masses and suspensions as well as electrical parts such as a capacitive-voltage conversion circuits for measuring different inertial information such as acceleration and angular rate. We report the design scheme for the natural frequencies of the inertial sensor element with which the mechanical parts and detection circuits are shared for a specific application such as for a vehicle electronic stability control system. This design scheme can also be applied for a device that contains peripheral circuits on the sensor element as well.
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  • Three-Dimensional Micro-Coil Oscillator Fabricated with Monolithic Process on LSI
    Tomotaka Yabe, Yasuhiro Mimura, Hirokazu Takahashi, Atsushi Onoe, Sho ...
    2011 Volume 131 Issue 10 Pages 363-368
    Published: October 01, 2011
    Released on J-STAGE: October 01, 2011
    DOIhttps://doi.org/10.1541/ieejsmas.131.363
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    Integration technique of three-dimensional micro coils on high-performance RF-LSI is one of the key technologies to realize future wireless telecommunication services and hypersensitive capacitance sensor systems. We design and fabricate monolithic three-dimensional micro coils on LSI substrate. The micro-coil has long legs, which will minimize electromagnetic coupling to the LSI substrate. We succeed in confirming the basic operation of the integrated oscillator circuit in GHz frequency range. It is conformed that process damages by plasma ashing, heating at 200 degrees Celsius, and sputter etching process are not observed in the oscillation performance.
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  • Contrast Control of Far-infrared Camera by Varying the Image Sensor Temperature
    Norio Fujitsuka, Hiroshi Naganawa
    2011 Volume 131 Issue 10 Pages 369-372
    Published: October 01, 2011
    Released on J-STAGE: October 01, 2011
    DOIhttps://doi.org/10.1541/ieejsmas.131.369
    JOURNAL FREE ACCESS
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    A far-infrared camera is thought to be well suited to detection of pedestrians at night. However, around sunset time during the summer, because the temperature difference between pedestrians and background objects becomes small, it is difficult to distinguish pedestrians with the far-infrared camera. To solve this problem, we propose a new contrast control method that is varying of the image sensor temperature. By means of increasing the image sensor temperature from 25 to 50°C the contrast between road and clothes, and sky and clothes increased about 1.54 and 1.64 times, respectively. The contrast between sky and skin increased about 1.55 times, but that between the road and skin did not increase. Because the emissivities of these objects were similar. The contrast control method is effective to detect objects with relatively large differences in emissivity at just about the same temperature.
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